// @ts-nocheck
import { requestAnimationFrame } from '../common/utils';
import { isObj } from '../common/validator';

const getClassNames = (name: string) => ({
  enter: `van-${name}-enter van-${name}-enter-active enter-class enter-active-class`,
  'enter-to': `van-${name}-enter-to van-${name}-enter-active enter-to-class enter-active-class`,
  leave: `van-${name}-leave van-${name}-leave-active leave-class leave-active-class`,
  'leave-to': `van-${name}-leave-to van-${name}-leave-active leave-to-class leave-active-class`,
});

export function transition(showDefaultValue: boolean) {
  return Behavior({
    properties: {
      customStyle: String,
      // @ts-ignore
      show: {
        type: Boolean,
        value: showDefaultValue,
        observer: 'observeShow',
      },
      // @ts-ignore
      duration: {
        type: null,
        value: 300,
      },
      name: {
        type: String,
        value: 'fade',
      },
    },

    data: {
      type: '',
      inited: false,
      display: false,
    },

    ready() {
      if (this.data.show === true) {
        this.observeShow(true, false);
      }
    },

    methods: {
      observeShow(value: boolean, old: boolean) {
        if (value === old) {
          return;
        }

        value ? this.enureEnter() : this.enureLeave();
      },

      enureEnter() {
        if (this.enterPromise) return;

        this.enterPromise = new Promise((resolve) => this.enter(resolve));
      },

      enureLeave() {
        const { enterPromise } = this;

        if (!enterPromise) return;

        enterPromise
          .then(() => new Promise((resolve) => this.leave(resolve)))
          .then(() => {
            this.enterPromise = null;
          });
      },

      enter(resolve: () => void) {
        const { duration, name } = this.data;
        const classNames = getClassNames(name);
        const currentDuration = isObj(duration) ? duration.enter : duration;

        if (this.status === 'enter') {
          return;
        }

        this.status = 'enter';
        this.$emit('before-enter');

        requestAnimationFrame(() => {
          if (this.status !== 'enter') {
            return;
          }

          this.$emit('enter');

          this.setData({
            inited: true,
            display: true,
            classes: classNames.enter,
            currentDuration,
          });

          requestAnimationFrame(() => {
            if (this.status !== 'enter') {
              return;
            }

            this.transitionEnded = false;
            this.setData({ classes: classNames['enter-to'] });
            resolve();
          });
        });
      },

      leave(resolve: () => void) {
        if (!this.data.display) {
          return;
        }

        const { duration, name } = this.data;
        const classNames = getClassNames(name);
        const currentDuration = isObj(duration) ? duration.leave : duration;

        this.status = 'leave';
        this.$emit('before-leave');

        requestAnimationFrame(() => {
          if (this.status !== 'leave') {
            return;
          }

          this.$emit('leave');

          this.setData({
            classes: classNames.leave,
            currentDuration,
          });

          requestAnimationFrame(() => {
            if (this.status !== 'leave') {
              return;
            }

            this.transitionEnded = false;
            setTimeout(() => {
              this.onTransitionEnd();
              resolve();
            }, currentDuration);

            this.setData({ classes: classNames['leave-to'] });
          });
        });
      },

      onTransitionEnd() {
        if (this.transitionEnded) {
          return;
        }

        this.transitionEnded = true;
        this.$emit(`after-${this.status}`);

        const { show, display } = this.data;
        if (!show && display) {
          this.setData({ display: false });
        }
      },
    },
  });
}
